Utrasone DJ PRO (Discontinued by Manufacturer) S-Logic natural surround sound moves the sound out of the headphones and into the room around you for a spacious three dimensional sound, as if you are in a live concert Protect your ears and experience less fatigue - pressure to the ear drum is decreased by up to 40% (3-4dB) for the same perceived loudness, significantly reducing the risk of hearing damage ULE technology with MU Metal shielding to reduce radiation by up to 98% compared to ordinary headphones Efficient 50mm Mylar driver provides impressive volume in the loudest of environments. And with S-logicT technology, you can wear them through long gigs without fatigue and hearing damage